protalus ramparts

rock glaciers









Thick talus accumulations in the Lairig Ghru below Srn na Lairige. Note the protalus rampart at the foot of the slope and the reworking of talus by debris flows and avalanches.



Periglacial features in the valleys and corries

Due to erosion by the last glaciers to occupy the corries and valleys, the periglacial features found here date from the Holocene and many are active today.

The most obvious and impressive features are those associated with steep slopes. Glacial over-steepening, combined with continuing frost action has led to rock slope instability and the production of large volumes of debris. A fundamental distinction is recognised in corries and glens partly filled by glacier ice in the Loch Lomond Stadial. Within the former glacier limits, volumes of talus are limited relative to those at the foot of slopes outside the limits. By implication, the greater volumes of debris reflect the more severe periglacial conditions that prevailed during the Stadial and perhaps also during the deglaciation of the last ice sheet (Ballantyne and Harris, 1994).